Visibility windows for determining the depth of visibility. | | Article | Order No. | | | Visibility window 20×20 cm | 39 22 34000 | | | with holding device and three-piece rod made of aluminium with lock. approx. 3 m long. Markings up to 100 cm, every 10 cm. | | | | Visibility window with 10-m rope | 39 22 34010 | | | Diameter 20 cm, markings every 10 cm, in conformance with EN 27027/ISO 7027. | |
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